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实现中文圆形印章的PHP类

时间:2021-07-01 10:21:17 帮助过:9人阅读

  1. /*
  2. * 中文圆形印章类
  3. * @author lkk/lianq.net
  4. * @create on 10:03 2012-5-29
  5. * @example:
  6. * $seal = new circleSeal('你我他坐站走东西南北中',75,6,24,0,0,16,40);
  7. * $seal->doImg();
  8. */
  9. class circleSeal {
  10. private $sealString; //印章字符
  11. private $strMaxLeng; //最大字符长度
  12. private $sealRadius; //印章半径
  13. private $rimWidth; //边框厚度
  14. private $innerRadius; //内圆半径
  15. private $startRadius; //五角星半径
  16. private $startAngle; //五角星倾斜角度
  17. private $backGround; //印章颜色
  18. private $centerDot; //圆心坐标
  19. private $img; //图形资源句柄
  20. private $font; //指定的字体
  21. private $fontSize; //指定字体大小
  22. private $width; //图片宽度
  23. private $height; //图片高度
  24. private $points; //五角星各点坐标
  25. private $charRadius; //字符串半径
  26. private $charAngle; //字符串倾斜角度
  27. private $spacing; //字符间隔角度
  28. //构造方法
  29. public function __construct($str ='', $rad = 75, $rmwidth = 6, $strad = 24, $stang = 0, $crang = 0, $fsize = 16, $inrad =0){
  30. $this->sealString = empty($str) ? '印章测试字符串' : $str;
  31. $this->strMaxLeng = 12;
  32. $this->sealRadius = $rad;
  33. $this->rimWidth = $rmwidth;
  34. $this->startRadius = $strad;
  35. $this->startAngle = $stang;
  36. $this->charAngle = $crang;
  37. $this->centerDot = array('x'=>$rad, 'y'=>$rad);
  38. $this->font = dirname(__FILE__) .'/simkai.ttf';
  39. $this->fontSize = $fsize;
  40. $this->innerRadius = $inrad; //默认0,没有
  41. $this->spacing = 1;
  42. }
  43. //创建图片资源
  44. private function createImg(){
  45. $this->width = 2 * $this->sealRadius;
  46. $this->height = 2 * $this->sealRadius;
  47. $this->img = imagecreate($this->width, $this->height);
  48. imagecolorresolvealpha($this->img,255,255,255,127);
  49. $this->backGround = imagecolorallocate($this->img,255,0,0);
  50. }
  51. //画印章边框
  52. private function drawRim(){
  53. for($i=0;$i<$this->rimWidth;$i++){
  54. imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],$this->width - $i,$this->height - $i,0,360,$this->backGround);
  55. }
  56. }
  57. //画内圆
  58. private function drawInnerCircle(){
  59. imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],2*$this->innerRadius,2*$this->innerRadius,0,360,$this->backGround);
  60. }
  61. //画字符串
  62. private function drawString(){
  63. //编码处理
  64. $charset = mb_detect_encoding($this->sealString);
  65. if($charset != 'UTF-8'){
  66. $this->sealString = mb_convert_encoding($this->sealString, 'UTF-8', 'GBK');
  67. }
  68. //相关计量
  69. $this->charRadius = $this->sealRadius - $this->rimWidth - $this->fontSize; //字符串半径
  70. $leng = mb_strlen($this->sealString,'utf8'); //字符串长度
  71. if($leng > $this->strMaxLeng) $leng = $this->strMaxLeng;
  72. $avgAngle = 360 / ($this->strMaxLeng); //平均字符倾斜度
  73. //拆分并写入字符串
  74. $words = array(); //字符数组
  75. for($i=0;$i<$leng;$i++){
  76. $words[] = mb_substr($this->sealString,$i,1,'utf8');
  77. $r = 630 + $this->charAngle + $avgAngle*($i - $leng/2) + $this->spacing*($i-1); //坐标角度
  78. $R = 720 - $this->charAngle + $avgAngle*($leng-2*$i-1)/2 + $this->spacing*(1-$i); //字符角度
  79. $x = $this->centerDot['x'] + $this->charRadius * cos(deg2rad($r)); //字符的x坐标
  80. $y = $this->centerDot['y'] + $this->charRadius * sin(deg2rad($r)); //字符的y坐标
  81. imagettftext($this->img, $this->fontSize, $R, $x, $y, $this->backGround, $this->font, $words[$i]);
  82. }
  83. }
  84. //画五角星
  85. private function drawStart(){
  86. $ang_out = 18 + $this->startAngle;
  87. $ang_in = 56 + $this->startAngle;
  88. $rad_out = $this->startRadius;
  89. $rad_in = $rad_out * 0.382;
  90. for($i=0;$i<5;$i++){
  91. //五个顶点坐标
  92. $this->points[] = $rad_out * cos(2*M_PI/5*$i - deg2rad($ang_out)) + $this->centerDot['x'];
  93. $this->points[] = $rad_out * sin(2*M_PI/5*$i - deg2rad($ang_out)) + $this->centerDot['y'];
  94. //内凹的点坐标
  95. $this->points[] = $rad_in * cos(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['x'];
  96. $this->points[] = $rad_in * sin(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['y'];
  97. }
  98. imagefilledpolygon($this->img, $this->points, 10, $this->backGround);
  99. }
  100. //输出
  101. private function outPut(){
  102. header('Content-type:image/png');
  103. imagepng($this->img);
  104. imagedestroy($this->img);
  105. }
  106. //对外生成
  107. public function doImg(){
  108. $this->createImg();
  109. $this->drawRim();
  110. $this->drawInnerCircle();
  111. $this->drawString();
  112. $this->drawStart();
  113. $this->outPut();
  114. }
  115. }

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